The rotation of the magnetic fields of the jovian planets is believed to also give us the rotation rate of the planet's core.

Name: The rotation of the magnetic fields of the jovian planets is believed to also give us the rotation rate of the planet's core.
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The rotation of the magnetic fields of the jovian planets is indeed used to infer the rotation rate of the planet's core because these magnetic fields are thought to be generated by the movement of conducting materials within the core.

The Rotation of the Magnetic Fields of the Jovian Planets